package servlet;

import com.fasterxml.jackson.databind.ObjectMapper;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/userInfo")
public class UserInfoServlet extends HttpServlet {
    private ObjectMapper objectMapper = new ObjectMapper();
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //从会话中拿到用户的信息返回
        HttpSession session = req.getSession(false);
        if(session == null) {
            resp.setContentType("text/html;charset=utf-8");
            resp.getWriter().write("当前用户未登录");
            return;
        }
        User user = (User)session.getAttribute("user");
        if(user == null) {
            resp.setContentType("text/html;charset=utf-8");
            resp.getWriter().write("当前用户未登录");
            return;
        }
        //此时把user对象转为json
        //user中含有密码, 不适合返回回去
        user.setPasswrod("");
        resp.setContentType("application/json;charset=utf-8");
        String respJson = objectMapper.writeValueAsString(user);
        resp.getWriter().write(respJson);
    }
}
